CN207111711U

CN207111711U - A kind of coaxial electromagnet structure of thrust magnetic bearing

Info

Publication number: CN207111711U
Application number: CN201721089267.8U
Authority: CN
Inventors: 林英哲; 胡思宁; 吴立华; 董继勇
Original assignee: Nanjing Cigu Technology Co Ltd
Current assignee: Nanjing Cigu Technology Co Ltd
Priority date: 2017-08-29
Filing date: 2017-08-29
Publication date: 2018-03-16
Anticipated expiration: 2027-08-29

Abstract

The utility model discloses a kind of coaxial electromagnet structure of thrust magnetic bearing, including iron core and magnet exciting coil, the iron core is cylindrical structural, axis hole and annular groove are provided with iron core, axis hole is coaxially disposed with annular groove, and axis hole is located at the circle centre position of iron core, and magnet exciting coil is in annular groove.The utility model will not produce eddy-current loss because thrust disc rotates, the small, small power consumption of magnetic bearing heating；The side of thrust disc only needs an iron core and a magnet exciting coil, manufactures and easy to assembly；The utility model electromagnet structure is firm, easy for installation.

Description

A kind of coaxial electromagnet structure of thrust magnetic bearing

Technical field：

It the utility model is related to a kind of coaxial electromagnet structure of thrust magnetic bearing.

Background technology：

Magnetic bearing carrys out indirect control pole pair controlled device generally by the exciting current size in control electromagnet Magnetic force size, so that controlled device suspends what is got up.Therefore electromagnet is one of kernel component of magnetic bearing.

Electromagnet is generally made up of the strip iron core of soft magnetic materials manufacture and the ring-shape field coil of insulated conductor coiling.One The common electromagnet structure of kind is as shown in Figure 1.

When passing through electric current in magnet exciting coil 2, you can magnetic field is produced in iron core 1, N, S are formed respectively at the both ends of iron core 1 Magnetic pole.Armature 800 (controlled object) surface manufactured from the magnetic field that core magnetic pole extends out in soft magnetic materials produces electromagnetism and inhaled Power, so that armature suspends.

The shortcomings that above-mentioned conventional field structure is：Magnetic bearing is largely effective when controlled object is static.But when controlled object During high-speed motion, magnetic field intensity and direction change in the relatively controlled body surface high-speed mobile of magnetic pole, controlled object, so as to Vortex is produced in controlled object, eventually results in controlled object heating, the increase of magnetic bearing power consumption.In thrust magnetic bearing, this Individual problem is particularly acute.

The rotor structure of thrust magnetic bearing is as shown in Fig. 2 the dish type armature 800 (commonly referred to as thrust disc) of soft magnetic materials is same Axle is fixed on rotor 400, and the electromagnetic force of two thrust magnetic bearings is respectively acting on two annular end faces of thrust disc, so as to flat The axial force of weighing apparatus different directions.

If above-mentioned thrust magnetic bearing uses the field structure of conventional electromagnetic iron, corresponding magnetic pole on one end face of thrust disc Position distribution may two kinds of situations (Fig. 3 and Fig. 4) as shown below.According to Fig. 3 and Fig. 4, it is clear that use the thrust of conventional magnetic pole In magnetic bearing, the magnetic field in thrust side surface is alternation (Fig. 3) or (Fig. 4) of pulsation, can all produce in thrust disc vortex and Heating.

The method for generally reducing eddy-current heating has two：

1) using silicon steel sheet manufacture thrust disc, and the magnetic line of force is allowed to be maintained in silicon steel plate plane；

2) magnetic field is allowed not rotate and change with thrust disc.

Because the magnetic line of force is axially to enter thrust disc, walked then along tangential (Fig. 3) or radial direction (Fig. 4).So If press method one, it is necessary to wind (Fig. 3) with one heart with silicon steel sheet or tangentially laminate (Fig. 4).But thrust disc is to rotate at a high speed Disk-shaped part, there is larger tangentially and radially tension inside, so above two structure is unsuitable for.Therefore will be in thrust Eddy-current loss is reduced in magnetic bearing can only use method two, that is, the magnetic field allowed in thrust disc does not change with rotation.For this Utility model provides a kind of coaxial electromagnet structure.

Utility model content：

The utility model does not change with rotation for the magnetic field that realization allows in thrust disc and provides a kind of thrust magnetic bearing Coaxial electromagnet structure.

There is technical scheme used by the utility model：A kind of coaxial electromagnet structure of thrust magnetic bearing, including iron core and Magnet exciting coil, the iron core are cylindrical structural, and axis hole and annular groove are provided with iron core, and axis hole is coaxially disposed with annular groove, And axis hole is located at the circle centre position of iron core, magnet exciting coil is in annular groove.

Further, the depth of the annular groove is slightly larger than the axial width of magnet exciting coil.

Further, the iron core is made of soft magnetic materials.

The utility model has the advantages that：

1) eddy-current loss will not be produced because thrust disc rotates, the small, small power consumption of magnetic bearing heating；

2) side of thrust disc only needs an iron core and a magnet exciting coil, manufactures and easy to assembly；

3) the utility model electromagnet structure is firm, easy for installation.

Brief description of the drawings：

Fig. 1 is the structure chart of electromagnet in the prior art.

Fig. 2 is structure chart of the thrust disc on rotor in the prior art.

Fig. 3 and Fig. 4 is the position of magnetic pole distribution map that thrust disc uses Fig. 1 electromagnet structures.

Fig. 5 is the utility model structure sectional view.

Fig. 6 is the sectional view of iron core in the utility model.

Fig. 7 is the structure chart of iron core in the utility model

Fig. 8 is installation diagram of the utility model on rotor.

Fig. 9 is the position of magnetic pole distribution map that thrust disc uses the utility model electromagnet structure.

Embodiment：

The utility model is further described below in conjunction with the accompanying drawings.

As shown in Figures 5 to 7, a kind of coaxial electromagnet structure of thrust magnetic bearing of the utility model, including iron core 1 and excitation Coil 2, iron core 1 are cylindrical structural, and axis hole 11 and annular groove 12 are provided with iron core 1, and axis hole 11 is coaxially set with annular groove 12 Put, and axis hole 11 is located at the circle centre position of iron core 1, magnet exciting coil 2 is in annular groove 12.

The depth of annular groove 12 is slightly larger than the axial width of magnet exciting coil 2.

Iron core 1 is made of soft magnetic materials.

With reference to Fig. 8, magnet exciting coil 2 is loaded thrust magnetic bearing electromagnet is formed in the annular groove 12 of iron core 1.Installation When, by two thrust magnetic bearing electromagnet sleeves on rotor 400, and kept between two thrust magnetic bearing electromagnet by spacer ring Spacing, the dish type armature 800 on rotor 400 are suspended between two thrust magnetic bearing electromagnet.During actual use, in iron core 1 End face on plastic end cover or back-up ring are set, to prevent coming off for magnet exciting coil 2.

The beneficial effects of the utility model are：

1) eddy-current loss will not be produced because thrust disc rotates, the small, small power consumption of magnetic bearing heating；Using coaxial annular electromagnetism In the thrust bearing of iron construction, the magnetic pole in thrust side surface is in donut (such as Fig. 9), in this structure, thrust disc spins When inside magnetic flux will not change, therefore will not because rotation produce eddy-current loss；With reference to Fig. 9, in the utility model The coaxial anchor ring for referring to N, S magnetic pole is coaxial with axis of rotor rotation line.

2) side of thrust disc (i.e. dish type armature 800) only needs an iron core and a magnet exciting coil, manufacture and assembling It is convenient；Thrust disc has multiple U-shaped electromagnet (Fig. 3 and Fig. 4) per side in the thrust bearing formed with conventional electromagnetic iron, therefore There are multigroup iron core and magnet exciting coil, manufacture installation is more troublesome, and the utility model structure may be such that thrust disc only has per side One iron core and a magnet exciting coil, therefore manufacture and assemble very convenient.

3) the utility model electromagnet structure is firm, easy for installation；With thrust in the thrust bearing of conventional electromagnetic iron composition Disk has multiple U-shaped electromagnet per side, it is therefore desirable to the relative position of extra base secured core, and pass through base and machine Shell coordinates positioning.And the utility model structure may be such that thrust disc side and only have a ring electromagnet, and ring electromagnet Profile is overall in firm cylinder, therefore sound construction and is easy to install positioning in casing.

Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art For art personnel, some improvement can also be made on the premise of the utility model principle is not departed from, these improvement also should be regarded as The scope of protection of the utility model.

Claims

A kind of 1. coaxial electromagnet structure of thrust magnetic bearing, it is characterised in that：Including iron core (1) and magnet exciting coil (2), the iron Core (1) is cylindrical structural, and axis hole (11) and annular groove (12) are provided with iron core (1), and axis hole (11) is same with annular groove (12) Axle is set, and axis hole (11) is located at the circle centre position of iron core (1), and magnet exciting coil (2) is in annular groove (12).
2. the coaxial electromagnet structure of thrust magnetic bearing as claimed in claim 1, it is characterised in that：The depth of the annular groove (12) Axial width of the degree slightly larger than magnet exciting coil (2).
3. the coaxial electromagnet structure of thrust magnetic bearing as claimed in claim 1, it is characterised in that：The iron core (1) is using soft Magnetic material is made.